E-L6221AD

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The E-L6221AD is a low-power BCD to 7-segment latch/decoder/driver IC with a 14-pin dual in-line package. It is a bipolar junction transistor (BJT) array that is designed to provide constant-voltage control and output current-sinking up to 80 mA (max). This device has latches that store data, decode the data into 7-segment code, and drive 7-segment LED or LCD displays.The E-L6221AD is mainly used to drive single 7-segment LED or LCD displays in matrix array applications. Additionally, it is often used as a switching device for both analog and digital signals in a variety of industrial applications, such as automotive and HVAC systems. It is also used in motion controls and computations, security systems, and special effects controllers.The E-L6221AD operates by converting BCD-encoded data (binary coded decimal) into 7-segment numerical format. BCD numbers are provided through the digital input pins which are then converted into a steady current sink of up to 80 mA. This current sink is then used to drive 7-segment displays.In specific applications, the E-L6221AD is typically connected as common anode. This setup allows more control over the current sink and increases the accuracy of the displayed numbers. The BCD input pins feed into 4 NAND gates which are used to decode the data into the desired output. The output pins are used to drive the display and each output can provide up to 80 mA of current.The current level settings for the E-L6221AD are designed to be flexible. In general, it can be configured to take input from a wide variety of sources and provide up to 80 mA of drive current with low current consumption. Additionally, it has high noise immunity and wide operating voltage range of 3.0-18V, making it suitable for a variety of applications.In conclusion, the E-L6221AD is a versatile array of bipolar junction transistors that can be applied in a variety of industrial applications. It can be configured for both single 7-segment LED or LCD displays, as well as multiplexed and matrix arrays. The flexibility of the current level settings make it a great choice for various applications due to its high noise immunity and wide operating voltage range. 

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